onsemi ESDONCAN1LT3G

Overview

ESDONCAN1LT3G from onsemi is a dual bidirectional ESD protection diode designed specifically for CAN and CAN-FD bus lines. It delivers 150 W peak power dissipation per line (8 × 20 µs), clamps at 33.4 V @ 1 A (8/20 µs), and features 10 pF line-to-GND capacitance at 1 MHz - enabling high-speed signal integrity in automotive and industrial network interfaces.

For engineers reviewing the ESDONCAN1LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include IEC 61000-4-2 Level 4 (±23 kV contact) compliance, matched diode capacitance (<2% mismatch), low reverse leakage (<100 nA @ 24 V), and AEC-Q101 qualification for automotive deployment.

Technical Context

The ESDONCAN1LT3G employs Zener-based dual-bidirectional TVS architecture optimized for transient suppression on differential CAN bus pairs. Its design targets fast response to ESD events (sub-nanosecond turn-on) while maintaining low dynamic capacitance to avoid signal distortion at CAN-FD data rates up to 5 Mbps.

It meets multiple surge immunity standards including IEC 61000-4-4 (50 A EFT), IEC 61000-4-5 (3.0 A lightning), and ISO 7637-2 Pulse 2 (8.0 A) - all with clamping voltage tightly controlled across pulse currents from 1 A to 20 A (TLP-tested).

Key Specifications

Pinout & Package

SOT-23 (TO-236) package, 2.90 mm × 1.30 mm × 1.00 mm, Pb-free, RoHS-compliant. Marking: "25EM" (device code + date + Pb-free indicator). Pin 1 = Cathode, Pin 2 = Cathode, Pin 3 = Cathode - configured as dual-cathode common-anode structure for bidirectional protection across two lines (CANH/CANL) sharing ground reference.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CAN bus ESD protection applications.

Compared with NUP4105MR6T1G and TPD2E001DRYR, the ESDONCAN1LT3G uniquely combines AEC-Q101 qualification, dual-line integration in SOT-23, 10 pF capacitance, and 150 W surge capability - making it the only drop-in solution for production automotive CAN-FD nodes requiring full IEC/ISO compliance.

Availability

ESDONCAN1LT3G is available at Aetrix Electronics and suitable for automotive CAN FD networks, industrial DeviceNet systems, Smart Distribution Systems (SDS), and heavy-duty vehicle control networks requiring stable component supply and long-term lifecycle support.

Supply support for ESDONCAN1LT3G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The ESDONCAN1LT3G belongs to onsemi's CAN/CAN-FD Bus Protector product line, engineered specifically to meet stringent automotive EMC requirements while enabling high-speed differential signaling integrity on harsh-environment serial buses.

FAQ

What is the primary function of the ESDONCAN1LT3G in a CAN bus system?

The ESDONCAN1LT3G serves as a dual-bidirectional transient voltage suppressor protecting CANH and CANL lines from ESD, EFT, and lightning-induced surges. It clamps transients to safe levels (e.g., 33.4 V @ 1 A) while maintaining low 10 pF capacitance to preserve signal integrity - critical for CAN-FD operation up to 5 Mbps. The ESDONCAN1LT3G is placed directly at the transceiver I/O pins to minimize inductance and maximize protection efficacy.

Does the ESDONCAN1LT3G support both CAN 2.1 and CAN FD protocols?

Yes, the ESDONCAN1LT3G supports both CAN 2.1 and CAN FD protocols. Its 10 pF line-to-GND capacitance and matched diode structure ensure minimal signal distortion at bit rates up to 5 Mbps (CAN FD), while its 24 V VRWM aligns with standard CAN bus operating voltages. The ESDONCAN1LT3G has been validated in CAN-FD reference designs and meets ISO 11898-2/3 requirements for physical layer robustness.

Is the ESDONCAN1LT3G AEC-Q101 qualified, and what does that mean for automotive use?

Yes, the ESDONCAN1LT3G is AEC-Q101 qualified - meaning it has passed accelerated stress tests including temperature cycling, high-temperature reverse bias, and ESD robustness specific to discrete semiconductors used in automotive applications. This qualification confirms suitability for under-hood and cabin environments where reliability across -55°C to +150°C junction temperatures is mandatory. The ESDONCAN1LT3G is approved for PPAP submission in Tier 1 automotive supply chains.

How does the ESDONCAN1LT3G differ from generic TVS diodes in CAN protection applications?

Unlike generic unidirectional or single-line TVS diodes, the ESDONCAN1LT3G integrates dual bidirectional protection in one SOT-23 package with matched capacitance (<2%), low leakage (<100 nA), and precise 24 V VRWM - all optimized for differential CAN signaling. Generic TVS diodes often exhibit >5 pF mismatch or lack IEC 61000-4-2 Level 4 certification. The ESDONCAN1LT3G's Zener architecture delivers faster turn-on and tighter clamping than avalanche-based alternatives, reducing transceiver stress during sub-ns ESD events.

What is the pin configuration of the ESDONCAN1LT3G, and how is it connected in circuit?

The ESDONCAN1LT3G uses a SOT-23 package with Pin 1 = Cathode (CANH), Pin 2 = Cathode (CANL), Pin 3 = Anode (GND). It connects as a common-anode dual-diode: CANH → Pin 1, CANL → Pin 2, and system GND → Pin 3. This configuration enables symmetrical clamping for both positive and negative transients on each line. The ESDONCAN1LT3G requires no external biasing and operates passively - conducting only during overvoltage events.